Isekai ni Houchi Game Riron wo Mochikondara Sekai Saikyou ni Nareru Setsu

A programmer who died of overwork at an exploitative "black company" is reincarnated in another world as a child named Sieg. Realizing he can use the knowledge from his past life, Sieg thinks, "If I apply idle game mechanics here, couldn't I become the strongest?" and resolves to become the ultimate mage.

After piling up basic magical training, in his seventh year in this new world, he succeeds in creating a spell called "Dark Puppets"—a fully automated system that defeats monsters and farms EXP and materials!?

Just by giving his Dark Puppets hunting orders at night and going to sleep, he rapidly levels up, completely surpassing anything adult adventurers could ever imagine――